JP4735181B2 - Visceral fat estimation method - Google Patents

Visceral fat estimation method Download PDF

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JP4735181B2
JP4735181B2 JP2005304189A JP2005304189A JP4735181B2 JP 4735181 B2 JP4735181 B2 JP 4735181B2 JP 2005304189 A JP2005304189 A JP 2005304189A JP 2005304189 A JP2005304189 A JP 2005304189A JP 4735181 B2 JP4735181 B2 JP 4735181B2
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visceral fat
subcutaneous fat
fat
thickness
visceral
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JP2007111166A (en
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和也 近藤
洋 永里
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Panasonic Corp
Panasonic Electric Works Co Ltd
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Matsushita Electric Works Ltd
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Description

本発明は内臓脂肪を推定する内臓脂肪推定方法に関するものである。   The present invention relates to a visceral fat estimation method for estimating visceral fat.

従来の内臓脂肪と皮下脂肪を同時に測定できる方法としては、Ｘ線を用いたＣＴや、ＭＲＩを用いて、生体の断層画像を撮影しその結果から求める方法があった。（例えば、非特許文献１参照）。   As a conventional method capable of simultaneously measuring visceral fat and subcutaneous fat, there is a method of obtaining a tomographic image of a living body by using CT using X-ray or MRI and obtaining the result. (For example, refer nonpatent literature 1).

また、腹部皮下脂肪厚と腹部周径囲から腹部内臓脂肪面積を求めるものがあった（例えば、先行文献１参照）。
臨床検査 ｖｏｌ．４２ ｎｏ．４ １９９８年４月 特開２０００−３５０７２７号公報 Moreover, there existed what calculated | required the abdominal visceral fat area from abdominal subcutaneous fat thickness and abdominal circumference circumference (for example, refer prior document 1).
Clinical examination vol. 42 no. 4 April 1998 JP 2000-350727 A

しかしながら、従来の非特許文献１のような構成では、機器が大型・複雑であり、個人が家庭で健康管理のための自己測定には使えなかった。また他の従来の構成である特許文献１では、腹部の皮下脂肪厚は臍の横や、脇の部分また、背中の部分で厚みが変化しているために、皮下脂肪を計測する部位が変われば推定される内臓脂肪面積も変動してしまう。また、人によっては臍の横での皮下脂肪は薄いが、背中側の皮下脂肪が厚い人もいるために、人によって異なる腹部の皮下脂肪のつき具合により、内臓脂肪を算出する精度が低下するという課題があった。そのために腹部周囲の皮下脂肪厚をすべて測定しようとすると、自己測定をする場合には、自分の目では直接確認できない背中の皮下脂肪を位置精度よく測定する必要があり、家庭用の小型機器では実現が困難であった。   However, in the conventional configuration such as Non-Patent Document 1, the device is large and complicated, and it cannot be used for self-measurement for health management at home by an individual. In Patent Document 1, which is another conventional configuration, the thickness of subcutaneous fat in the abdomen changes at the side of the navel, at the side or at the back. For example, the estimated visceral fat area also varies. Also, depending on the person, the subcutaneous fat along the side of the navel is thin, but there is a person with thick subcutaneous fat on the back side, so the accuracy of calculating visceral fat is reduced due to the degree of subcutaneous fat on the abdomen that varies from person to person. There was a problem. For this reason, when trying to measure all the subcutaneous fat thickness around the abdomen, when performing self-measurement, it is necessary to measure the subcutaneous fat on the back, which cannot be confirmed directly by one's own eyes, with a small household device. It was difficult to realize.

本発明は、前記従来の課題を解決するもので、腹部皮下脂肪のつき具合の固体差を考慮した高精度な内臓脂肪推定方法を提供することを目的とする。   An object of the present invention is to solve the above-described conventional problems, and to provide a highly accurate visceral fat estimation method that takes into account the difference in the degree of abdominal subcutaneous fat.

前記従来の課題を解決するために、本発明の内臓脂肪推定方法は皮下脂肪厚が規定値以上かどうかで、内臓脂肪推定式を切り替える。   In order to solve the above-described conventional problems, the visceral fat estimation method of the present invention switches the visceral fat estimation formula depending on whether the subcutaneous fat thickness is equal to or greater than a specified value.

本発明の内臓脂肪推定方法によれば、臍横の既定の位置での皮下脂肪厚と腹部周囲径とから、高精度に内臓脂肪を推定することができる。 According to the visceral fat estimation method of the present invention, visceral fat can be estimated with high accuracy from the subcutaneous fat thickness and the abdominal circumference at a predetermined position next to the umbilicus .

以下本発明の実施の形態について、図面を参照しながら説明する。   Embodiments of the present invention will be described below with reference to the drawings.

（実施の形態）
図１（ａ）は、本発明の実施の形態における腹部臍位置での生体断面画像の一例である。図１の上側が生体での前面であり、上部中央に臍１がある。臍１には皮下脂肪２は存在せず、その横から急激に皮下脂肪２は増加しているが、臍横５ｃｍの位置では皮下脂肪厚はほぼ安定しており、多少位置ずれをしても再現性良く皮下脂肪厚を測定することができる。また、臍１を基準とすることで被験者の自己測定が容易である。ここで、皮下脂肪厚を測定する方法は、キャリパーを用いた方法や、超音波を用いた方法、赤外光を用いた方法がある。それぞれの測定器の皮下脂肪２を測定する部位の横５ｃｍに目印をつけ、被験者はその目印を臍１に合わせて測定することで、位置あわせがさらに容易となる。次に、腹部周囲径３を測定する方法はメジャーを臍１の位置で合わせることで測定再現性が良い測定が可能となる。また、腹部周囲径３は呼吸などの影響でも変化するので、呼吸が止まっているかもしくは、呼吸がもっとも息を吐いた時を検知して、腹部周囲径３を測定することで、測定再現性が向上する。 (Embodiment)
FIG. 1A is an example of a biological cross-sectional image at the abdominal umbilical position in the embodiment of the present invention. The upper side of FIG. 1 is the front surface of the living body, and the umbilicus 1 is in the upper center. There is no subcutaneous fat 2 in the umbilicus 1, and the subcutaneous fat 2 increases rapidly from the side, but the thickness of the subcutaneous fat is almost stable at the position of 5 cm across the umbilicus, and even if it is slightly displaced Subcutaneous fat thickness can be measured with good reproducibility. In addition, by using the umbilicus 1 as a reference, the subject's self-measurement is easy. Here, methods for measuring the subcutaneous fat thickness include a method using a caliper, a method using ultrasonic waves, and a method using infrared light. A mark is placed on a side 5 cm of the site where the subcutaneous fat 2 of each measuring instrument is measured, and the subject can measure the mark along the umbilicus 1 to make positioning easier. Next, the method of measuring the abdominal circumference 3 enables measurement with good measurement reproducibility by aligning the measure at the position of the navel 1 . In addition, since the abdominal circumference 3 also changes due to the influence of breathing or the like, measurement reproducibility can be achieved by detecting when the breathing has stopped or when the breathing is most exhaled and measuring the abdominal circumference 3. improves.

図１（ｂ）や図１（ｂ）のように、皮下脂肪２のつき方が被験者によって異なるために、腹部の皮下脂肪厚と腹部周囲径３からそのまま内臓脂肪４の面積を推定すると推定誤差が大きくなる課題に対して、本発明者は臍横の皮下脂肪２が薄いときに、背中側の皮下脂肪２が厚い場合は存在するが、臍横の皮下脂肪２が厚いときに、背中側の皮下脂肪２が薄い場合は存在しないことに着目することで、皮下脂肪２が薄い場合と厚い場合で換算式を切り替えることを考案した。   As shown in FIG. 1 (b) and FIG. 1 (b), since the method of attaching the subcutaneous fat 2 varies depending on the subject, if the area of the visceral fat 4 is estimated as it is from the subcutaneous fat thickness of the abdomen and the abdominal circumference 3 the estimation error In the case where the subcutaneous fat 2 on the lateral side of the umbilicus is thin, the present inventor exists when the subcutaneous fat 2 on the back side is thick. It was devised to switch the conversion formula between the case where the subcutaneous fat 2 is thin and the case where the subcutaneous fat 2 is thin.

臍横５ｃｍの位置での皮下脂肪厚が２０ｍｍ以下の場合には、背中の皮下脂肪２の個体差による、ばらつきは存在するが、腹部断面積における皮下脂肪面積の割合は少ないため、ほぼ一定とみなすことで、内臓脂肪面積の換算式は皮下脂肪厚の項を含まずに腹部周囲径Ｌと定数で表し式１とすることができる。 If the subcutaneous fat thickness at the position of Hozoyoko 5cm is 20mm or less, due to individual differences of the subcutaneous fat 2 back, variations exist, since the ratio of the subcutaneous fat area in the abdominal cross-sectional area is not small, substantially constant Therefore, the conversion formula for the visceral fat area does not include the term of subcutaneous fat thickness, and can be expressed by the abdominal circumference L and a constant as Equation 1.

ＶＦＡ＝Ａ×Ｌ−Ｃ・・・・（式１）
また、臍横の位置での皮下脂肪厚が２０ｍｍ以上の場合、背中部分の皮下脂肪厚も厚いので、腹部断面積における皮下脂肪面積の割合は皮下脂肪厚にほぼ比例して増加すると考えられる。そこで、式１に皮下脂肪厚の補正項Ｂ×（Ｔ−Ｔ０）を追加して、式２となる。 VFA = A × LC (Expression 1)
In addition, when the subcutaneous fat thickness at the lateral position of the umbilicus is 20 mm or more, the subcutaneous fat thickness of the back portion is also thick, so the ratio of the subcutaneous fat area in the abdominal cross-sectional area is considered to increase almost in proportion to the subcutaneous fat thickness. Therefore, the correction term B × (T−T0) for subcutaneous fat thickness is added to Equation 1 to obtain Equation 2.

ＶＦＡ＝Ａ×Ｌ−Ｂ×（Ｔ−Ｔ０）−Ｃ・・・・（式２）
ここで、ＶＦＡは内臓脂肪面積、Ａ，Ｂ，Ｃは定数。Ｌは腹部周囲径３、Ｔは臍横５ｃｍでの腹部皮下脂肪厚、Ｔ０は腹部皮下脂肪厚の既定値２ｃｍである。 VFA = A * LB * (T-T0) -C (Formula 2)
Here, VFA is the visceral fat area, and A, B, and C are constants. L is the abdominal circumference diameter 3, T is the abdominal subcutaneous fat thickness at 5 cm across the umbilicus, and T0 is the default value of 2 cm for the abdominal subcutaneous fat thickness.

また、これらの換算式を用いて推定された内臓脂肪面積ＶＦＡが０ｃｍ２の実際には存在し得ない値となる場合に、ＶＦＡの値を最小値として規定された値ＶＦＡ０へ丸めることで、腹部周囲径が極端に短い被験者に対しても、内臓脂肪推定を行うことが出来る。   Further, when the visceral fat area VFA estimated using these conversion formulas is a value that cannot actually exist of 0 cm2, the abdomen can be obtained by rounding the VFA value to the value VFA0 defined as the minimum value. Visceral fat estimation can be performed even for a subject with an extremely short circumference.

これらの換算式を用いた推定値とＭＲＩ画像を用いた内臓脂肪の測定値を比較したグラフが図２であり。このようにして、高精度に内臓脂肪を自己測定した結果から推定することができる。   FIG. 2 is a graph comparing the estimated values using these conversion formulas and the measured values of visceral fat using MRI images. In this way, the visceral fat can be estimated from the result of self-measurement with high accuracy.

ここで、各定数Ａ，Ｂ，Ｃ，Ｔ０、ＶＦＡ０の決定方法は、ＭＲＩやＣＴで測定した内臓脂肪面積と、腹部周囲径と臍横５ｃｍの皮下脂肪厚を多数の被験者で測定を行い、誤差が小さくなるように決定される。図２のグラフを作成した場合の各定数の値はＡ＝８．２２ｃｍ、Ｂ＝７４ｃｍ、Ｃ＝５９０ｃｍ２、ＶＦＡ０＝３０ｃｍ２である。   Here, the determination method of each constant A, B, C, T0, VFA0 is to measure the visceral fat area measured by MRI and CT, the abdominal circumference diameter and the subcutaneous fat thickness of 5 cm across the umbilicus in many subjects, The error is determined to be small. When the graph of FIG. 2 is created, the values of the constants are A = 8.22 cm, B = 74 cm, C = 590 cm 2 and VFA 0 = 30 cm 2.

本発明にかかる内臓脂肪推定方法は、自己測定した腹部周囲径と臍横５ｃｍの位置での皮下脂肪厚から高精度に内臓脂肪を推定する方法として有用である。   The visceral fat estimation method according to the present invention is useful as a method for estimating visceral fat with high accuracy from self-measured abdominal circumference and subcutaneous fat thickness at a position of 5 cm across the umbilicus.

本発明の実施の形態における内臓脂肪推定法の説明図Explanatory drawing of the visceral fat estimation method in the embodiment of the present invention 前面の皮下脂肪が薄く、背中の皮下脂肪が厚い場合の腹部断面図Cross section of the abdomen when the subcutaneous fat on the front is thin and the subcutaneous fat on the back is thick 前面の皮下脂肪が厚く、背中の皮下脂肪が厚い場合の腹部断面図Cross section of the abdomen when the subcutaneous fat on the front is thick and the subcutaneous fat on the back is thick 本発明により推定した内臓脂肪面積とＭＲＩによる実測値の比較結果を示す図The figure which shows the comparison result of the visceral fat area estimated by this invention, and the measured value by MRI

符号の説明Explanation of symbols

１ 臍
２ 皮下脂肪
３ 腹部周囲径
４ 内臓脂肪 1 Umbilical 2 Subcutaneous fat 3 Abdominal circumference 4 Visceral fat

Claims (5)

内臓脂肪面積を推定する方法において、臍横の規定の位置での皮下脂肪厚が規定値以上の場合に、臍位置での腹部周囲径と前記皮下脂肪厚とから内臓脂肪を推定し、また、前記皮下脂肪厚が規定値より小さい場合には、前記腹部周囲径のみから内臓脂肪を推定する内臓脂肪推定方法。 In the method of estimating the visceral fat area, when the subcutaneous fat thickness at a prescribed position next to the umbilicus is not less than a prescribed value, the visceral fat is estimated from the abdominal circumference at the umbilical position and the subcutaneous fat thickness, and A visceral fat estimation method for estimating visceral fat only from the abdominal circumference when the subcutaneous fat thickness is smaller than a prescribed value. 規定の位置と臍との距離はおよそ５ｃｍである請求項１記載の内臓脂肪推定方法。 2. The visceral fat estimation method according to claim 1, wherein the distance between the prescribed position and the umbilicus is approximately 5 cm. 皮下脂肪厚の規定値はおよそ２０ｍｍである請求項１記載の内臓脂肪推定方法。 Visceral fat estimation method according to claim 1, wherein the specified value of subcutaneous fat thickness is approximately 20 mm. 内臓脂肪の推定結果が内臓脂肪面積の予め規定された下限値より小さい場合にこの下限値を推定結果とする請求項１記載の内臓脂肪推定方法。 Predefined visceral fat estimation method of claim 1 wherein the lower limit value and the estimation result is smaller than the lower limit value of the estimated results visceral fat area of the visceral fat. 皮下脂肪厚をＴ、臍位置での腹部周囲計をＬ、皮下脂肪厚の規定値をＴ０とすると内臓脂肪ＶＦＡの推定式は、定数Ａ，Ｂ，Ｃを用いて、Ｔ≧Ｔ０の場合にＶＦＡ＝Ａ×Ｌ−Ｂ×（Ｔ−Ｔ０）−Ｃ・・・・式１で表され、Ｔ＜Ｔ０の場合にＶＦＡ＝Ａ×Ｌ−Ｃ・・・・式２で表され、推定式の推定結果が下限値ＶＦＡ０より小さい場合には、内臓脂肪面積を下限値ＶＦＡ０とする内臓脂肪推定方法。 When the subcutaneous fat thickness is T, the abdominal circumference at the umbilical position is L, and the prescribed value of the subcutaneous fat thickness is T0, the visceral fat VFA is estimated using constants A, B, and C when T ≧ T0. VFA = A.times.LB.times. (T-T0) -C... Expressed by equation 1, and when T <T0, VFA = A.times.LC. If the estimation result lower limit VFA0 smaller than, visceral fat estimation method among the visceral fat area and the lower limit value VFA0.
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